package com.my.util;

import java.util.UUID;

public class UuidUtil {

	
	 public static String get32UUID() {
		 return UUID.randomUUID().toString().trim().replaceAll("-", "");
	 }
	 
	 private static String digits(long val, int digits) {  
		    long hi = 1L << (digits * 4);  
		    return Numbers.toString(hi | (val & (hi - 1)), Numbers.MAX_RADIX)  
		            .substring(1);  
		}  
		  
		/** 
		 * 以62进制（字母加数字）生成19位UUID，最短的UUID 
		 *  
		 * @return 
		 */  
		public static String uuid() {  
		    UUID uuid = UUID.randomUUID();  
		    StringBuilder sb = new StringBuilder();  
		    sb.append(digits(uuid.getMostSignificantBits() >> 32, 8));  
		    sb.append(digits(uuid.getMostSignificantBits() >> 16, 4));  
		    sb.append(digits(uuid.getMostSignificantBits(), 4));  
		    sb.append(digits(uuid.getLeastSignificantBits() >> 48, 4));  
		    sb.append(digits(uuid.getLeastSignificantBits(), 12));  
		    return sb.toString();  
		}  
}
